Omits to say one doesn't garage it (6,3)
I believe the answer is:
leaves out
'omits' is the definition.
('leave out' can be a synonym of 'omit')
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for leaves out that I've seen before include "Overlooks" , "evidence that spring has arrived?" , "Excludes" .)